Bar pointing machine



Jan. 26, 1932. E, 955 1,842,704

BAR POINTING MACHINE Filed June 27, 1929 5 Sheets-Sheet 1 T? Li WMMFW A. E. VOSS BAR POIN'IING MACHINE Jan. 26, 1932.

Filed June 27, 1929 3 Sheets-$heet 2 INVENTOR 6. E544 A. E. VOSS Jam. 26, 1932.

BAR POINTINGMACHINE Filed June 27. 1929 3 Sheets-Sheet INVE/V 70R 174% ,arrofi/vim Patented Jan. 26, 1932 ALFRED EMIL VOSS, OF HAMPSTEAI), LONDON, ENGLAND BAR POINTING MACHINE Application filed June 27, 1929, Serial No. 374,146, and in Great Britain April 26, 1929.

This invention relates to an improved bar pointing machine.

According to the present invention said machine comprises in combination a bar clamping device, a positioning stop against which the work is fed, a head adapted to carry a bar point cutting tool, and means which effects the closing of the bar clamping device, moves the stop away from the bar the head to present the cutting tool. The said means likewise operates the parts in the reverse sense.

The means may comprise either. a single hand lever or a power driven shaft.

Preferably auxiliary means are provided for effecting an initial adjustment of the head to adapt it for various tapers and/or different sizes of bars and similarly auxiliary it means may be provided for adjusting the initial opening of the clamping device to enable it to clamp different sizes of bars.

Preferably also the arrangement is such that the head is moved quickly from its initial position until it is adjacent the bar and then moved slowly up to the bar to effect the pointing thereof and thereafter quickly returned to its initial position.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a longitudinal vertical sectional elevation, Fig ure 2 a section on the line H II, Figure 1, Figure 8 a sectional elevation on the line TIT-III Figure 1 and Figure 4 a detail plan view. Figures 57 are views of a modification, Figure 5 being a partsectional longitudinal elevation, Figure 6 an end sectional elevation and Figure 7 a part sectional plan view.

Referring more particularly to Figures 1-4, 1, 2 are clamping jaws having dovetailed projections 3 extending into transverse dovetailed guideways formed in guides 4. The jaws 1, 2 are formed with tongues 5 cut at their sides to a V as indicated at 6 the sides of which clamp the bar to be pointed, the tongues 5 011 one jaw extending, when the jaws are clamping the bar, between the tongues 5 on the other aw. Fast with the jaws are downwardly projecting rods 7 on clamped in the clamping device, and moves the lower ends of which are mounted rollers 8 extending into diverging grooves 9, 10 formed in a block 11 secured to a slide 12 having a dovetailed projection 13 extending into longitudinal guideways formed in the bed 14 of the machine. Mounted in the slide 12 is a block 12 formed with a downwardly projecting boss 15v on which is mounted a roller 16 which extends into a cam groove 17 formed in the periphery of a hollow cylindrical cam block 18.

Extending through the bore of the cam block 18 is a longitudinal shaft 19 whose end is bored to receive a screw threaded rod 20 journalled in a thrust cap 21. and fast with an actuating handwheel 22. The screw threaded rod 20 is in engagement with a screw threaded aperture formed in a rib or spoke 23 extending diametrically across a ring 24 the inner diameter of which embraces the outer diameter of the shaft 19, the said ring being secured to the cam block 18.

.Also secured to the shaft 19 is a cam ring 25 against which bears a roller 26 mounted on one end of a lever 27 pivotally mounted at 28 and-urged by a spring 29 to rock in an anti-clockwise direction. The upper end 30 of the lever 27 is shaped to form a stop against which the bar to be pointed is pressed.

The shaft 19 is also provided with a cylindrical cam block 31 having a cam groove the portion 32 of which is of suchshape as to impart to a roller 83 in engagement therewith a quick initial movement, whereafter the portion. 34 imparts a slow movement and the remaining portion of the groove imparts a quick movement to the roller 33 in the reverse direction. The roller 33 is mounted on a pin 35 secured to a block 36 slidably mounted in guides formed in ahead 37. The block 36 is normally locked against movement with respect to said head by a screw threaded rod 38 rotatably but not slidably mounted in a bearing 39 screwed into the head 37, and the screw threaded rod is fast with an actuating hand-wheel 40.

The head 37 forms a mounting for a shaft 41 to which is secured a pulley 42, driven as by a belt from an overhead shaft, and to which is secured a tool carrier 43 adapted to ready for the reception of a bar which is fed.

between the separated jaws 1 and 2 of the clamp up to the stop formed by the end 30 of the lever 27. I

The hand-wheel 47 isnow rotated in a clockwise direction as seen in Figure 1, whereby the shaft 19 and with it the cams 18, 25, 31 is rotated through the bevel gears 44 and 45.

The rotation of the cam 18 causes the block 1 12, and with it theslide 12 to slide to the left as seen in Figure 1 with the result that the divergent grooves '9, 10 slide the jaws 1,

2 towards one another to engage and clamp the bar; the jaws are held in this clamping position by a portion of the cam groove 17 which is parallel with the end of the cam 18.

The cam 25 now rocks the lever 27 in a clockwise direction againstthe action of its spring 29 and thus moves the stop constituted by the upper end 30 of the lever away from the bar held in the jaws 1, 2.

Simultaneously with, and following, the above operations, the portion 32 of thecam groove in the cam block 31 has caused the head 37 to slide to the right as seen in Figure 1 with a comparatively quick movement followed by a slow movement due to the portion 34 of the cam. The quick movement causes the cutter to be presented to the endof the bar clamped by the jaws, and the slow movement'slowly advances the head to cause the cutter to effect the bar pointing.

Continued rotation'of the shaft now causes the remainder of the cam groove in the cam Q block 31 to return the head 37 to its initial position with a comparatively quick movement. While this operation is being effected, the cam groove 17 slides the block 12 and slide 12 to the right whereby the jaws 1, 2 are caused to separate by the divergent grooves 9, 10 and at the'same time the cut away portion of the cam 25 comes opposite the roller 26 which thereby allows the lever 27 to'be rocked by the spring 29 in an anticlockwise direction to allow its upper end to return to the position shown in'Figure 2.

To effect an adjustment of the jaws to cause them to clamp difierent sizes of bar, the handwheel 22 is rotated whereby the screwed rod 20 causes the cam block 18, block 12' andslide 12 to slide along the shaft 19, and the divergent grooves 9, 10 to vary the initial separation of the jaws 1, 2, so that the constant amplitude of movement imparted by the cam groove 17 to the aws causes them to clamp the bar.

position of the head;

Rotation of the hand-wheel 4O efiects an adjustment of the head 37 and hence of the cutter to enable the constant extent of movement imparted to the head by the cam block 31 to cause the cutter to out either different sizes of bars or to cut different lengths of tapers. WVhen the hand-wheel is rotated, the screwed rod 38 slides the head 37- with respect to the block 36 which during this adjustment remains stationary and this varies the initial It will be seen that, when once the bar to be pointed has been placed between the jaws .1, 2 and positionedagainst the-stop,'the following operations are automatically effected with a single revolution of the hand-wheel (a) The jaws 1, 2 are caused to move towards one another to clamp the bar.

p (b) Thestop 30-is moved out of the path of the cutting tool. 7

(a) The head 37 is movedtowards the bar with a quick movement until the cutter is near the'end of the bar and then slowly while the cutter moves into engagement'withthe bar and cuts the'taper thereon. I

(cl) Thehead 37 is moved in the reverse direction with 'a quick movement.

: (e) The jaws 1, 2 are caused to recede from one another to release the bar and (f) The stop 30 is moved againinto operative. position.

In the modification illustrated in Figures 57, the cam shaft 19 is power driven instead of being driven by the hand-Wheel 47:" In this modification on the shaft 19 is freely mounted a worm Wheel 48 in mesh with a worm 49 secured to avertical shaft 50 mounted in bearings 51. To this shaft 50'is also secured a worm-wheel 52 in mesh with a worm 53 secured to an extension 54 of the spindle 41 whichlatter is, as described with reference to Figures 1-5,-power driven by a belt passing over the belt pulley 42. n

In order thatthe shaft 19 shall be disconnected from the power drive at the end of each complete cycle of operations an auto? matic clutch device is provided which consists of a part 55 secured to the worm wheel 48 and a second part 56' slidably but not rotatably mounted on the shaft 19,,the said parts 55 and '56 having interengaging projections and recesses 57 The part 56 is formed with a groove 58 into whichextend pins 59 on a forked actuating lever 60 pivoted at 61 and coupled by a link 62to' a hand actuated control lever 63 located near the clamp end of the machine.

V Rotatably mounted on the lever 60 is a col lar 64 which normally is prevented from axial movement along the leverby a screw 65' extending into a groove 66. 'The collar is pressed by a, spring 67 into engagement with a cam disc 68 keyedto the shaft 19. and having a cut away portion 69. I

In operation, when the machine is at rest,

the

the cut away portion 69 is opposite the collar as which latter extends under the influence of the spring 67 into said cut away portion and thus moves the projections 57 out of engagement with the recesses thereby disconnecting the shaft 19 from the power driven shaft.

When a bar has been placed in the clamp and positioned by the stop 30, the hand lever (33 is rocked in an anti-clockwise direction and held momentarily in this position. The projections 57 are thus moved into engagementwith the recesses whereby drive is transmitted from the power driven worm wheel -18 to the shaft 19. Rotation of the shaft 19 also causes rotation of the cam disc 68 the cut away portion in which moves out of register with the collar 64 shortly after rotation is commenced. The collar is now prevented from returning to its original position by the uncut periphery of the cam disc thus enabling the lever 63 to be released.

The shaft 19 in its rotation passes through the sequence of operations described with reference to Figures L4: and at the end thereof the cut away portion 69 again comes into register with the collar 64: whereupon the spring 67 moves the projections 57 from engagement with the recesses and thus automatically disconnects the drive to the shaft 19.

What I claim is 1. In a bar-pointing machine, the combination of a bar clamping device adapted to support the bar as supplied to the machine, a stop engageable by the bar to position the bar, operating means for actuating said clamping device after positioning of a bar by said stop, operating means for moving said stop into and out of effective position, a tool holder, operating means for moving said tool holder towards and away from the bar, a single actuating hand lever, and means connecting said hand lever to the operating means.

2. In a bar-pointing machine, the combination of a pair of clamping jaws, a slidably mounted block having divergent grooves therein, projections on said jaws extending into said grooves, a shaft, a cam mountedon said shaft, a projection on the block extend- ;in into engagement with said earn, a pivoted lever, the upper end of which constitutes a stop, a second cam on the said shaft for controlling the movement of said lever into and out of effective position, a slidably mounted head, a third cam on said shaft, a projection on said head extending into engagement with said third cam, a spindle rotatably mounted in said head, a tool carrier mounted on said spindle, and means for rotating the said shaft.

3. In a bar-pointing machine, the combination of a pair of clamping jaws, a slidably mounted bloclr having divergent grooves therein, projections on said jaws extending into said grooves, a shaft, a cam mounted on said shaft, a projection on the block extend ing into engagement with said cam, a pivoted lever, the upper end of whicl'r constitutes a stop, a second cam on the said shaft for controlling the movement of said lever into and out of effective position, a slidably mounted head, a third cam onsaid shaft, a projection on said head extending into engagement with said thirdcam, a spindle rotatably mounted in said head, a tool carrier mounted on said spindle, and a hand wheel for rotating the said shaft.

4. In a bar-pointing machine, the combination of a pair of clamping jaws, a slidably mounted block having divergent grooves therein, projections on said jaws extending into said grooves, a shaft, a cam slidably mounted on said shaft, means for preventing relative rotation between the shaft and cam, means for sliding the cam along said shaft, a projection on the block extending into en gagement with said cam, a pivoted lever, the upper end of which constitutes a stop, a second cam on the said shaft for controlling the movement of said lever into and out of effective position,-a slidahly mounted head, a third cam on said shaft, :1 block, means for adjustably connecting said block to the head, a projection on said blockextending into engagement with said third cam, a spindle rotataloly mounted in said head, a tool carrier mounted on said spindle, and means for rotating the said shaft.

In a bar- :)ointing machine, the combina tion of a pair ofclamping jaws, a slidably mounted block having divergent grooves therein, projections on said jaws extending into said grooves, a shaft, a cam slidahly mounted on said shaft means for preventing relative rotation between the shaft and cam, means for sliding the cam along said shaft, a projection on the block extending into ongagement with said cam, a pivoted lever, the upper end of which constitutes a stop, a second cam on the said shaft for controlling the movement of said lever into and out of effective position, a slidably mounted head, a third cam on said shaft, a block, means for adjustably connecting said block to the head, a projection on said block extending into engagement with said third cam, a spindle rotatably mounted in said head, a tool carrier mounted on said spindle, and a hand wheel for rotating the said shaft.

6. In a bar-pointing machine, the combinationsof a pair of clamping aws, a slidably mounted block having divergent grooves therein, projection on said jaws extending into said grooves, a shaft, a cam mounted on said shaft, a projection on the block extending into engagement with said cam, a pivoted lever, the upper end of which constitutes a stop, a second cam on the said shaft for controlling the movement of said lever into and out of effective .position, a slidably mounted head, a third cam on said shaft, a projection on said head extending into engagement with said third cam, a spindle rotatably mounted in said head, a tool carrier mountedonsaid spindle, a second shaft, a hand-wheel for rotating said second shaft, and gearing connecting said second shaft to said first-mentioned shaft.

'7. In a bar-pointing machine, the combinationof a pair of clamping jaws, a slidably -mounted block having divergent grooves therein, projections on said jaws extending into said grooves, a shaft, a cam slidably mounted on said shaft, means for preventing relative rotation between the shaft and cam, means for sliding the cam along said shaft, a projection on the block extending into engagement with said cam, a pivoted lever, the upper end of which constitutes a stop, a second cam on the said shaftfor controlling the movement of said lever into and out of eifec tive position, a slidably mounted head, a third cam on said shaft, a block, means for adjustably connectingsaid block to the head, a projection on-said block extending into engagement with said thirdcam, a spindle rotatably mounted in said head, a tool carrier mounted on said spindle, a second shaft, a hand-wheel for rotating said second shaft, and gearing connecting said second shaft to said first-mentioned shaft.

8. In a bar-pointing machine, the combination of apair of clamping jaws, a slidably mounted block having divergent grooves therein, projections on said jaws extending into said grooves, a shaft, a cam slidably mounted on said shaft, means for preventing relative rotation between the shaft and cam, a screw threaded rod engaging said cam, means for rotating said rod to slide the cam along the shaft, a projection on the block extending into engagement with said cam, a pivoted lever, the upper end of which constitutes a stop, asecond cam on the said shaft for controlling the movement of said lever into and out of effective position, a slidably mounted head, a third cam on said shaft, a block, a screw threaded rod engaging said block, means for rotating said rod to slide the head with respect to said block, a projection on said block extending into engagement with said third cam, a spindle rotatably mounted in said head, a tool carrier mounted on said spindle, and-means for rotating the said shaft. I

9. In a bar-pointing machine, the combination of apair of clamping'jaws, a slidably mounted block having divergent grooves therein, projections on said jaws extending into said grooves, a shaft, a cam slidably mounted on said shaft, means forpreventing relative rotationbetween the shaft and cam,

screw threaded rodengagin'g said cam,

means forrotati-n'g said rod to slide the cam along the shaft,-a projection on the block extending into engagement with said cam, a pivoted lever, the upper end of which constitutes 'a stop, a'second camon the said shaft for controlling the movement of said lever into :and out of effective position, a slidably mounted head, a third cam on said shaft, a block, a screw threaded rod engaging said block, means for rotating said rod to slide the head with respect to said block, a projection on said block extending into engagement with said third cam, a spindle rotatably mounted in said head, a tool carrier mounted 'on said spindle, and a hand-wheel for rotatingthesaid shaft.

V V '10. In a bar-pointing machine, the combination ofia pair of clamping jaws, a slidably mounted block having'divergent grooves therein, projections on said jaws extending into said grooves, a shaft, av cam slidably mounted on said shaft, means for preventing relative rotation between the shaft and cam, a screw threaded rod engaging said cam, means for rotating said rod to slide the cam along the shaft, a projection on the block extendinginto engagement with said emit, a pivoted lever, the upper end of'which constitutes a stop, a second cain on the said shaft for controlling the movement'of said lever intoand out of effective position, a 'slidably m unted head, a third cam 0-11 said shaft, a block, a screw threaded rod engaging said block, means for rotating said rodto slide the head with respect to 'saidblock, a projection on said block extending into engagement with 0 said third cam, a spindlerotatably mounted in said head, a tool carrier mounted on said spindle, a second shaft, a hand-wheel for rotating said second shaft, and gearing connecting said second shaft to said first-men- 4 tioned shaft.

11. In a, bar pointing machine, the "combination of, a displaceable stop for abutmentby the end of the barto position the latter, means to support the bar in stop-engaging position, a clamping device operable to 'engage the bar while supported by said means, a. tool holder movable axially towards and away from the end of the bar clamping device, and actuating means for operating the clamping device, the stop and the tool holder in automatic sequence, the operating of the stop moving the same out of the path of the tool holder to enable a tool carried by the tool %older to engageand-point the end of the 12. In a bar pointing machine, the combination of, a displaceable stop for abutment by the end of the bar to position the latter, a block to support the bar in stop-engaging position, a bar-clamping device operable to engage the bar while supported by said block, normally spaced clamping jaws mounted on said block operable to-engage the bar after positioning on said block, a tool holder 'movahle axially towards and away from the said clamping jaws, an actuating shaft, cams on the shaft to operate the clamping jaws, the stop and the tool holder in automatic sequence, the operation of the stop moving the same out of the path of the tool holder to enable a tool carried by the tool holder to engage and point the end of the bar.

13. In a bar pointing machine, the comhination of means for adjusting the jaws, a displaceahle stop for engagement by the end of the bar to position the latter, means to support the bar in stop-engaging position, normally spaced jaws on said har presenting a vertically unrestricted slot for reception of the bar, said jaws forming parts of a clampingdevice operable to engage the bar after positioning on said means, a tool holder movable axially toward and away from the end 520 of the said clamping jaws, means for adjusting the tool holder, an actuating); shaft, cams on the shaft to directly operate the clamping jaws, the stop and the tool holder in auto matic sequence, the operation of the stop moving the same out of the path of the tool holder to enahle a tool carried by the tool holder to engage and point the end of the bar.

14. In a har-pointing machine, the com- 3t hination of clamping jaws, a shaft, means operable by said shaft to move the jaws into and out of har-clamping position, a cam mounted on said. shaft, a pivoted lever, the upper end of said lever constituting a stop, a second cam on said shaft for controlling the movement of said lever into and out of operative position, a slidahly mounted head, a third cam on said shaft, a projection on said head in engagement with said third cam, said first cam serving to operate the first men tioned means, a spindle rotatably mounted in said head, a tool carrier mounted on said spindle, and means for rotating the said shaft.

15. In a liar-pointingmachine, the comhination of a pair of clamping jaws, a slidahlv mounted hlock havi diverginggrooves therein, projections on said jaws extending into said grooves. a shaft, a cam mounted on to said shaft, a projection on the lolock extending into engagement with said cam. a stop element, a second cam on said shaft for controlling the movement of said stop element into and out of operative position. slidaloly mounted head, a third cam on said shaft, a

projection on said head extending into engagement with said third cam, a spindle rotatahly mounted in said head, a tool carrier mounted on said spindle, and means for rona tatinp; said shaft.

In. testimony that I claim the :l'oregoingf to he my invention, 1 have signed my name this [0 day of June, 1929.

ALFRED EMIL VOSS.

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